English verb conjugation
MUST GNASH

Regular verb: gnash - gnashed - gnashed

Affirmation

Simple form	V-ing form
I must gnash you must gnash she must gnash we must gnash you must gnash they must gnash	I must be gnashing you must be gnashing she must be gnashing we must be gnashing you must be gnashing they must be gnashing
Perfect	V-ing perfect
I must have gnashed you must have gnashed she must have gnashed we must have gnashed you must have gnashed they must have gnashed	I must have been gnashing you must have been gnashing she must have been gnashing we must have been gnashing you must have been gnashing they must have been gnashing

Negation

Simple form	V-ing form
I mustn't gnash you mustn't gnash she mustn't gnash we mustn't gnash you mustn't gnash they mustn't gnash	I mustn't be gnashing you mustn't be gnashing she mustn't be gnashing we mustn't be gnashing you mustn't be gnashing they mustn't be gnashing
Perfect	V-ing perfect
I mustn't have gnashed you mustn't have gnashed she mustn't have gnashed we mustn't have gnashed you mustn't have gnashed they mustn't have gnashed	I mustn't have been gnashing you mustn't have been gnashing she mustn't have been gnashing we mustn't have been gnashing you mustn't have been gnashing they mustn't have been gnashing

Interrogative form

Simple form	V-ing form
must I gnash? must you gnash? must she gnash? must we gnash? must you gnash? must they gnash?	must I be gnashing? must you be gnashing? must she be gnashing? must we be gnashing? must you be gnashing? must they be gnashing?
Perfect	V-ing perfect
must I have gnashed? must you have gnashed? must she have gnashed? must we have gnashed? must you have gnashed? must they have gnashed?	must I have been gnashing? must you have been gnashing? must she have been gnashing? must we have been gnashing? must you have been gnashing? must they have been gnashing?

Interro-negative form

Simple form	V-ing form
mustn't I gnash? mustn't you gnash? mustn't she gnash? mustn't we gnash? mustn't you gnash? mustn't they gnash?	mustn't I be gnashing? mustn't you be gnashing? mustn't she be gnashing? mustn't we be gnashing? mustn't you be gnashing? mustn't they be gnashing?
Perfect	V-ing perfect
mustn't I have gnashed? mustn't you have gnashed? mustn't she have gnashed? mustn't we have gnashed? mustn't you have gnashed? mustn't they have gnashed?	mustn't I have been gnashing? mustn't you have been gnashing? mustn't she have been gnashing? mustn't we have been gnashing? mustn't you have been gnashing? mustn't they have been gnashing?